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Table I – Satellite Galaxies of the Milky Way and M31

A. Milky Way*
 

Galaxy Distance1
kpc
Year2 M(V)3 Diameter4
kpc
Sagittarius (Sgr) 50 000 1994 -13.4 >10 000?
Large Magellanic Cloud (LMC) 160 000 ---- -18.1 20 000
Small Magellanic Cloud (SMC) 180 000 ---- -16.2 15 000
Ursa Minor (UMi) 220 000 1954 -8.9 1000
Sculptor (Scl) 260 000 1938 -11.1 1000
Draco (Dra) 270 000 1954 -8.8 500
Sextans (Sex) 290 000 1990 -9.5 3000
Carina (Car) 330 000 1977 -9.3 500
Fornax (For) 450 000 1938 -13.2 300
Leo II 670 000 1950 -9.6 500
Leo I 830 000 1950 -11.9 1000
 

1 Approximate galactocentric distance in light-years (1 kpc= 3260 l.y.)
2 Year of discovery
3 M(V) absolute V magnitude
4 A rude estimation of the diameter in light-years

*This table is from Mike Irwin’s (Institute of Astronomy, Cambridge, UK) web site, accessed January 2003.

Current website: http://www.ast.cam.ac.uk/people/Mike.Irwin. (Accessed April 14, 2014).

B. M31&
 

GALAXY DISTANCE in kpc Lv 107 Sun Diameter in kpc
M32 (NGC221) 750 30 8
IC10 820 10  
NGC147 760 12 13.2
NGC185 600 10 11.7
LGS3 810 0.06  
AndI 770 0.5 1.4
AndII 590 0.3 1.6
AndIII 770 0.1 0.75
AndV 810 0.03  
AndVI 830 0.3  


&Data from this table taken from Sparke, 2000 and Cox, 2000. 

 

 

Table II - The Milky Way versus M31

Parameter Milky Way M31
Globular Clusters ++ +++
Gas and Dust ++ +
Star Formation ++ +
SMBH at galaxy center ++ ++++
Disk Size +++ ++++
Number of Stars ++ +++
Luminosity ++ +++
Luminous Mass ++ +++
Dark Mass ++++ ++


Subjective Rating Schema in Comparison with Other Spiral Galaxies

0 – minimal

+ - below average

++ - average

+++ - above average

++++ - superior  

 

 

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